What a good time to be doing it right? The big stage in the playoffs where literally everyone is watching. That includes other teams. I think Terry is going to be a casualty of the guard crunch we got going on this offseason in a trade for a big if we land the number 1 pick and grab Fultz. There just wouldnt be minutes to be had between Fultz, Bradley, Smart, Isaiah. If we end up with four and get Tatum or Jackson, he is safe.
I think us fans have to continue to work on letting go of the old 1 thru 5 paradigm: PG SG SF PF C and rather, embrace the new small ball, position-less era. Through these playoffs 3 of the following four (IT, AB, TR, MS), in various combinations have shared the court together for significant minutes. It is pointless to say that when IT, AB, & MS are out together that MS is the SF. Modern basketball requires lots of switching, being able to defend all sorts of players with different skill sets.
There's room and enough minutes for IT, AB, TR, M Fultz, MS & JB to cover 3 of the 5 slots on the court. That of course allows time for JC and AH and all the new youngsters in the other 2 slots.
We don't necessarily need a tall rebounding rim protector next year. We need ten or eleven hard nosed basketball players, and we already have seven. 
I absolutely disagree.
Position-less basketball is a farce. You make adjustments based on matchups.
When we played Chicago, we excelled when we had Green and Crowder out there at SF/PF, giving us extra shooters.
When we tried the same starting lineup against Washington we started the game 0-16, and didn't start to come back until some size (Olynyk) got injected in to the game. Morris and Gortat were destroying us.
People get way too carried away with the small ball concept based on the fact that teams like Cleveland and Golden State are able to excel with small lineups. People ignore the fact that even though Cleveland does not have a very physically large front court, their bigs (Love and Thompson) are both excellent rebounders.
Likewise Golden State is starting a 6'8" Draymond Green at PF - but he happens to also be an outstanding rebounder.
You can kinda get away with having a smaller front line if those guys can still control the boards. We have a small frontline that doesn't rebound - you can't have that and expect to succeed.
We desperately need a PF who can rebound at the very least, and preferably one who is also capable of scoring and/or defending bigs down low.
We don't play small ball because it's superior, we play small ball because we have no choice - there is no "big ball" lineup on this roster. Our biggest players are Olynyk and Horford, and they both play a small ball style.