Hmm you are very generous with your list there.
I would not say Irving (overrated), Dragic, Millsap, Ellis, current Rose, current Gasol, current Wade, Beal, Giannis, Parker, and Monroe (especially Monroe) are as good as you think. Most of the 9 players (obviously Irving is a 'star'..I just think he is overrated) I listed are not stars and most of them are not head and shoulders better than IT or where Smart may potentially end up.
Dragic, Millsap, current Rose, current Wade, Monroe, Ellis, and Beal are especially not anything to write home about relative to the players on this team. IT outplayed Dragic on his own team in Phoenix, and their constant back and forth led to both of them being traded in the end. Millsap is alright, but there is no reason Sullinger and/or Olynyk can't match him up within a year or two if not now. Current Rose is an inefficient volume scorer who can't pass that well. Wade is still good but there are injury concerns there. Beal is awesome in the playoffs, but he has yet to put together anything but an average regular season for a NBA player. He's not close to IT's efficiency and scoring volume. Monroe has no game outside the paint and can't defend if his life depended on it. Red flag in my book. At least have some range if you can't defend well.
Giannis and Parker have potential. I'll give you that. Most of your list, though...all it proves to me is actually how "okay" the Celtics are relative to this conference. There isn't a lot of star power on this coast.
The only stars on your list are Lebron, Love (so underrated), Bosh, George, Butler (I'm reaching on this one honestly), and Wall. I don't think we have players who can match those 5-6 players. Hopefully we can get a player with that kind of potential in the 2016 draft via BKN. The other 9-10 you listed, though? I'm not losing sleep over it. We have enough potential on this team to match and surpass the likes of Monta Ellis and Monroe.
Some gotta relax. The talent on this team is far better than most of you give it credit for.
EDIT: I forgot Horford. That guy is legit. I'd put him with that short list of stars in the East.