let's say dennis leaves for a while, maybe even 1 or 2 episodes into s13, but can you imagine mac being left behind? alone in their flat, that's just fucking sad. and it would definitely hit mac the hardest if dennis really leaves :(
WHY YES, ANON, I CAN IMAGINE IT AND IT’S BREAKING MY MCFUCKING HEART
especially if they do end up pretending to be a couple, and we are actively treated to mac being happy as dennis’ boyfriend
again, I’m not of the opinion that it’ll be a permanent change, if and only if because (1) dennis is one of the main five (2) glenn is one of the big three (3) the show doesn’t make a point to change the game up for good like that; more accurately it makes a point to not make a point of game-changing (although, credit to them for following through on the times they have, like not just handwaving away old black man or their twice burned-down apartment. they put their money where their mouths are at least, I’ll give them that).
but I can see dennis leaving for let’s say one or two episodes into s13, because from a writer’s standpoint, the premise “what does the gang look like minus a member?” sounds really interesting. like, 1301 can open up with reflections of the gang getting along without dennis, focusing on each character doing something they ordinarily would’ve done with dennis, except this time not. I imagine a time-skip would come into play here (but I think they do that anyway with each season), so it could be implied that dennis has been gone for a few months at least.
now, if I were a sunny writer, I’d take the opportunity to explore the gang minus dennis getting over him, in a sense (esp because his relationships with all four of the others are pretty well-explored, even by the show’s standards). and I’d especially relish the opportunity to give mac a lot of growth here, given how dependent he is on dennis. remember, they’ve been a fixture in each other’s lives for about twenty years, maybe a little more; they’ve lived together for just as long and share so many aspects of their lives already. without being hyperbolic, it would crush mac to see dennis go. but it would also be fascinating, again from a writer’s perspective, to see him get over dennis and take steps towards better mental health (at least as far as his codependency is concerned).
and then of course dennis comes back for some reason and the gang isn’t falling over themselves to take him back in. you can easily argue that dennis is one of the gang’s worst influences, like as a dennis stan I’ll readily give you that, so to see mac, dee, frank, and charlie all kind of realize ‘we miss the guy but like not that much, and hey we’re all still alive and kicking’ would be an interesting means of character development, especially if dennis returns and has to confront the gang after they’ve had these realizations.
also mac would totally have a steady boyfriend and dennis would be hella jealous and RCG I’m writing it before you do okay
they’re putting me out of business I swear to god