A thousand times yes.
The throuple path is my 'canon' path, and I really enjoy the slow and believable way the three of them are brought closer to one another. It hasn't been long since Alex and the MC met ISA, and even less time since the two of them became an official couple, so the way BTT has been writing this so far has been very satisfying.
I am really looking forward to when they become a throuple, less for any sex scenes but more for the emotional impact. But the road to that is just as rewarding as the final destination, IMO.
Rushing things would take away something from their journey towards eachother.