HOW SAFE ARE REMAINING TEAMS?
BMW Sauber - secure
Large budget, safe despite 25% slump in BMW sales
Ferrari - very secure
Future not in doubt. Huge fanbase, beating heart of F1
Force India - secure
Owned by billionaire Vijay Millay, well-funded for 2009 at least
McLaren - very secure
Sound finances, strong core of sponsors
Red Bull - secure
Owned by billionaire Dietrich Mateschitz, money no object
Renault - vulnerable
Manufacturing losses make team vulnerable to Honda-style pull-out
Toro Rosso - safe
Also owned by Mateschitz - how long can he sustain two teams?
Toyota - vulnerable
Very large budget, car sales down, could struggle
Williams - vulnerable
Big losses in 2007, no car maker or billionaire backing

link copied from the bbc website, which appears to be pointing fingers at redbull, toro rosso, renault toyota and williams as being potentially the next to pull the plug on their f1 invovlement

but where as f1 is the pinicale of motorsport, if there are only 5 teams in the running, what will happen?