He says he has 1-2 years of content, but he says a lot of things.
Besides having a bunch of models and animations is one thing but realistically is just adding new models and animations ad nauseum really going to be enough to maintain the playerbase? At some point it all just ends up looking like the same content, especially if said content is gated behind an obnoxious grind and/or further payments.
We've seen a good amount of future concepts and stuff and the artists are working still while waiting on the game to fix up and finally start releasing content so this is probably mostly true, though probably uneven completion of this future content with some more complete than others.
Implementing it properly should, in theory, be easy but we're stuck waiting for them to fix the current game state before having any hopes of this which means we're seeing research passes delayed, too. Sucks but makes sense.
For the time being I don't see it becoming too similar with regards to content, but more than 2 years from now? How many monsters and poses can they come up with? Especially if they don't support 4-way and 5-way poses? I do see it eventually hitting a brick wall for older characters.
I just can't see them maintaining even a moderately sized playerbase with that approach, even if they work out the kinks (which they probably won't), and when you're trying to amortize ongoing development costs and operational costs over not only a small playerbase but the fraction of that playerbase you can convert to paying customers? It doesn't seem like a very good plan.
I see no reason they can't fix the bugs, but obviously despite the delay of bringing on new programmers they should have done so at this point because clearly, in the long run, it would have made a huge difference considering current rate of progress is fairly abysmal with bug fixing. Even now it would, clearly, still be very worth it to bring more people on and catch them up because just mainly Helius isn't cutting it.
The player base issue I'm not so sure about. They've been able to maintain it despite lack of updates for quite some time as is and once we get past the technical woes content will start releasing somewhat regularly. Its still highly ranked on Steam and, if we're being totally honest, there isn't much competition in this space. Wild Life doesn't fit this niche as its mainly humanoids and VaM's state is tragic if we're being nice about it. There are a few others that are making very glacial progress and don't have much hope of being viable competition anytime soon.
I suppose it would make more sense to compare it to his actual competition like Wild Life, how many models are in that game already? Tens? Hundreds? Or Carnal Instinct, similar numbers for NPC models and fully customizable character model. No mindless grind on those either.
The only really comparable games in terms of releasing with 0 gameplay systems are probably some illusion titles but those are true sex sims and they come with far more customization, the ability to import your own models, animations, mods etc.
There might not be any devs doing anything quite as stupid as this but that doesn't mean there's no competition, all those titles are still going to draw players away from this game especially when pretty much its only real attraction has ever been what it could have been and that it was the first announced porn game for UE4.
Wild Life has a lot of stuff going for it but damn are the characters so fucking ugly. I'm embarrassed for the developer tbh. Imagine making a sex game but the main thing you look at is ugly as fuck. No matter how you dress something up it is still the same at its core unless you change the core, itself.
Illusion is, as you say, probably the closest competitor and much to their own incompetent misfortune not a threat at this point.
The biggest competitor is actually quite possibly Afterparty. It is easily the best looking sex game on the market, period, and a great initial showing of Unreal Engine 5. Its only weakness is its much newer than other established products and so while its graphics, characters, and customization are easily leading the party it has zero content whatsoever in terms of sex or gameplay for the time being. While Wild Life focuses on humanoids and isn't directly competing in FD:OL's direct audience if they can fix their characters it could still readily soak some types of customers but despite all the complaints people make about it the developer seems to quite literally give zero fucks whatsoever about fixing their heinous, frankly offensive, ugly ass characters.