I think that the self defense class will give Dylan some confidence in his ability to fight (likely misplaced if going up against someone who is a fighter but...) and I think that this could become part of the Dylan/Marie story arc which would be great.
I also think that this training could give Dylan the confidence to try to intervene if he saw Logan trying to force Ellie to do something she didn't want to do. We already know that Logan is a bruiser - he lost out on an opportunity when he beat up the son of one of the agency executives during a party. He also likes to drink and doesn't seem bothered about losing control.
So - if Dylan intervened to try to save Ellie (because brothers and sisters will fight but they will also stand together against others who attack any family members), even if he failed and got beaten up, this could continue to help heal the rift between them. Imagine Sophia overhearing this conversation:
Ellie: 'Dylan, why did you step in to save me. You took a major beating from Logan.'
Dylan: 'Ellie you're my Sister - of course I'm going to try to protect you.'
Ellie: 'You know that you could not beat him in a fight right?'
Dylan: 'I didn't think about that - I saw him hurting you and I had to do something to stop him'
Ellie: 'There is no way to hide the damage he did to you... What are you going to say to Mom (Please don't tell her about Logan she thinks)'
Dylan: 'I'll tell her I got into a fight with a couple of guys on the way home from school. Mom will get mad and I might get grounded but I don't care about that.'
Ellie: 'Stop moving your face around, I'm trying to put on the antiseptic.'
Dylan: 'Why are you trying to help me?'
Ellie: 'You got beaten up trying to help me so I figure I can do this to help pay you back... but don't get used to it (said with a bit of a smile on her lips and the first kind-hearted teasing tone Dylan thinks he's ever heard from Ellie towards him)'
Sophia smiles to herself and quietly goes back downstairs to her office.
____
Yes - this is the kind of thing that can happen to help heal the rift between Dylan and Ellie.
If you don't like Dylan - I suspect that you Don't want to see this kind of rapprochement.
If you like Dylan - I believe that you will approve of this type of event.
In either case, we'll have to see if L&P advances the story relationships using the self defense classes as stepping stones/a catalyst for relationship changes.
Sorry for this late reply.
I don't 'dislike' Dylan and normally wouldn't have any problem with this development. If it ended in just friendship.
The problem is that the little fuck obviously wants his sister, not only his mother (whaaat a fucking surprise). In the little event they had, Dylan spent a lot of time undressing Ellie with his eyes and even took advantage of her hug to try and get a feel.
So yeaaah, it will probably end in Dylan trying to get some. The harem and whatever.
Ellie would not accept it for what we know about her character, she is not attracted to Dylan in ANY way. She is mostly disgusted and sometimes feels her privacy threated by the little pervert. To make such a development possible we would see Ellie's mentality getting changed to fit Dylan's desire better and i don't want to see my favorite character turning into a man-boy's harem member.
That's what makes me apprehensive about this plot line. If this don't happen, kudos to their friendship~