Maybe, but we don't know how many teams will be willing to spend, a 10 million a year contract is huge. How many teams would really go higher than that for a PG who in all odds still won't be able to shoot? And the Celtics would still retain the rights to match.
Good points, clearly many teams are clearing cap space for next season. There is no guarantee that the economy might be that much better (we hope it will but there is still 14+% unemployment in many big cities), that will be evaluated by how attendance figures and merchandizing money looks at the end of this season. Many teams may still be looking to save money and opt to not sign high dollar contract players yet.
The thing is, there is also still an excellent chance Lebron and DWade resign with their current teams. There is absolutely no one out there left on next seasons market that will command the salaries they will. I seriously doubt that there will be teams overspending for a 'consolation prize' level FA. I believe instead most will attempt to sign multiple players at the 6-10 million range who are proven.
Rondo would be wise to accept a 5/50 contract from the Celtics if it comes his way IMO. I think he is well worth it now, but in a couple years when he doesnt has Paul, Ray and KG to play off of? That may be the most he ever gets a chance at. As good as he is, he still isnt Chris Paul, Deron Williams, etc good.