I think it is both too much for us to give up and also not what Orlando would be looking for. If you are going to trade your best player, it has to be for younger players and picks, not lesser players on worse contracts and picks that won't be that great.
In terms of the type of player we are talking about, I am all for it. Here are some of the similar players that sometimes get talked about and their age and approximate average salary for the next few years:
Sabonis 23 $20M
Vucevic 30 $22M
JGrant 28 $20M
Turner 24 $18M
Markkanen 23 $?? (RFA)
My point is that I am not sure that Vucevic is really the player to go "all in" for. None of these players are necessarily going to be available to us any more than Vucevic is. It is possible that we had a chance to get Turner for Hayward but to me, he is the least valuable of these bigs. I don't mind doing something that involves Kemba to get this type of big but I am not sure any of them are worth Kemba plus 3 future firsts.
To me, the most "gettable" (but still difficult) of these is Markkanen. I proposed Kemba + 1 first for Markkanen and Otto Porter elsewhere. We may end up needing to match an offer in the $20M range on Markkanen but I feel that is a better medium or long term investment than Vucevic even if Vucevic is better right now.