all good points, but the olympics shows that they CAN play together. the three of them are apparently good friends, and have been planning this for a while. they might have to give up a few millions, butthey still be filthy rich, and what they lose in salary they'll probably make up in other ways if they become a winning dynasty (which is pretty much guaranteed if this goes through).
and as far as filling the roster, there will be a line of players who will be willing to accept the minimum (still a lot of money) to play with them (and get a ring or two in the process).
Playing together for a couple months like with the Olympic team is a lot different from playing a whole season, through the playoffs, and winning the title. (And I'm not saying I don't want them to do it, just that I doubt it will work.)
As a Laker fan, I still remember the last we tried to do this, when we signed both Karl Malone and Gary Payton to minimum contracts to give them a chance to win a title and assemble one of the most All-Star-laden teams of all-time. Admittedly, that team came very close to winning the championship in 2004, but ultimately failed because:
1) Payton was either never willing or not able to adjust to the triangle offense and couldn't contribute much because of it.
2) Malone was slowed by an injured knee late in the season, which got worse in the playoffs, so by the time the finals came along he could barely jump.
3) All of the Laker role players (outside of Shaq, Kobe, Malone, and Payton) underperformed in the playoffs, leaving Shaq and Kobe to play two on five on offense.
4) And most importantly, they came up against a Pistons team that was playing its best basketball of the season, somehow gelling into a superstar-less, unselfish team at exactly the right time.
There are so many obstacles to even a favored team winning the title. While a LeBron-Wade-Bosh-led team in Miami would certainly be an instant contender, it's very premature to guarantee them even one title, much less to call them a dynasty. Even the 2008 Celtics, who had two stars (Garnett and Allen) arrive to turn the team's fortunes around completely, had a core of solid roleplayers in Rondo, Perkins, Davis, Posey, Tony Allen, etc. Miami has no one of that caliber yet and it will be difficult to find them.
Let's say that it happens and all three of them are signed to play together for the next five years. It wouldn't just be this season that Riley would have to juggle incoming, cheap role players to complement the new Big Three; that would have to be done every season with a lot of turnover from year to year. Even if Riles can recruit some talented players to take minimum salaries to play there, it's an enormous number of players to change out in one offseason. I suppose if anyone can fuse them all into a team it's Pat Riley, but the odds are really against it. The media pressure on them to live up to those expectations would be enormous, but it would be a fascinating thing to see them try to do.
And if it does happen, is there any doubt that Riley bumps Spoelstra aside to coach that team? Isn't that inevitable?