A few fairly random, but relevant points...
Jamal Crawford will turn 36 next season. In other words, he will be nearly as old as Marion and older than Miller is this season.
Does he "replicate" JR Smith? Of course not perfectly, but he would be playing the same role as scoring SG. At this point, I'd rather invest in a 30 year old Smith, who has demonstrated chemistry on this team, than a 35/36 year old Crawford. Plus, Crawford is under a team option (either that or a partial guarantee), so you'd probably have to trade for him.
A silly player to target unless JR opts out and goes elsewhere.
Thanks to Gouri for laying out how the Cavs could conceivably add Aldridge while keeping the big 3. I don't think it's a good idea, but as Gouri himself says it's important that all options be considered.
Some analytics guys don't particularly like Aldridge, since he is reliant on post ups and long 2s (low efficient shots). Others argue his post threat opens the court for his teammates. I guess I am somewhere in the middle, but no one believes he is particularly effective defensively, especially as a center.
If Love leaves (which I don't think very likely at all), then you could explore LA, but I think I would prefer Love on this team.
A while ago, I posted that the Cavs 2015-16 team salary, assuming everyone of consequence is back, was conservatively in the $102M range with only 11 players, and more realistically closer to $107M. I think we are looking at a figure more like $110M.
Despite that inflated team salary, the Cavs would have really no backup to LeBron (I'm not counting Mike Miller as a legitimate backup at this point), and feel despite the cost they really need to invest in bringing in a guy who can backup LeBron and also preferably play smallball 4. I'll throw out some names:
Jerebko
Teletovic
Wesley Johnson
Babbitt
Mbah a Moute
Dudley
Singler
Aminu
Some of these guys -- especially Aminu -- won't be available for the Cavs' $3.4M taxpayers MLE, but many of them will be. Some may even be minimum guys.
If, despite their team salary, the Cavs want to invest even more, they could use the Haywood contract. The guy I would probably target is Marvin Williams. Can stretch the floor with his shooting, play backup at the 3, and smallball 4. Has been around forever since being overdrafted back in 2005, but still turns only 29 this summer.
Given the realities of the Cavs' salary structure, Gouri makes good points about pulling off a big trade to provide some salary relief and maybe land another big player. I can just say that'd be really risky, at least from a personnel standpoint. From a salary standpoint though, it is something that at least has to be considered. My guess is the Cavs end up trying to bring back pretty much the current roster.