Holy revisionist history batman. Coco Crap? Crisp was a 3+ WAR player in 2007 and a HUGE reason why the team was as good as it was. He provided more WAR than Manny that year!
It was another story in 2008, but Ellsbury didn't debut in 2008, so if you're going to maintain this narrative when Crisp was just this vagrant suckbag begging to be replaced, you have no idea what you're talking about.
Ellsbury was called up to play a temporary role to replace DREW, not Crisp. Drew was out with one of his borderline injuries at the time and they needed an outfielder in the wake of the Murphy trade. Crisp had had a fine season in 07 when Ells first got the call, mostly spearheaded by his fantastic defense.
Ellsbury then procdeded to make himself impossible to send down, and Crisp proceded to still largely win the battle for the starting CF role throughout the season on his very strong D. Ellsbury found himself slotted into the CF and other OF positions as the team needed him. In fact he played significantly more time in left field (33 games) and right field (22 games) than in center (16 games, only 12 starting). The man was our 4th outfielder effectively for most of the second half after Wily Mo flamed out and Murphy was traded.
He was technically the 4th OF in the postseason but played a bigger role in the World Series after (IIRC) Crisp banged himself up against the wall on the last play of Game 7 of the ALCS.
It was only when Crisp left in the 2008-2009 offseason that Ellsbury became the real fulltime starting CF -- Cameron notwithstanding.
As for a need for Bogaerts -- perhaps you missed it, but Bogaerts has some experience at third base including playing there in the WBC this year. He's got more than enough natural talent for 3B and a number of scouts say that's where he's going to wind up anyway. And we have a bit of a hole there just now, so there is some serendipity to speculate about a potential callup here. It's by no means a slam dunk but don't pooh-pooh the idea entirely.