Kind of interesting, but way too weak for 2 players in this form.
At the beginning of the game it would be remodel if your opponent trashed an estate, which is bad because you could have had remodel for the same cost, and not given your opponent that free Estate trashing. Later in the game, your opponent is unlikely to have any >1 cost cards they want to trash, so it is remodel without the +2 coins, which is also bad.
I think it is too dependent on number of players as worded. You might consider only allowing the opponent to your left to trash a card. If your first opponent trashes an Estate, the second can't really risk trashing one anyway, because they definitely don't want you trashing an Estate into a Gold.
If you make the trashing mandatory, this turns into an attack... probably one that is too mean to balance.
I think it is more compelling if you allow the active player to trash up to 2 cards. Maybe only 1 if your opponent trashed, maybe not. If you got this with 2 Estates and your opponent trashed one, that might be too strong.