This, if and when it happens, shall weaken Arsenal severely and strengthen an aging Chelsea.
Whatever is done, shall be after the present season, and, as is rightly stated by Mr. Ivan in his post, this ongoing title race, is likely to be settled in favour of MU.
This, alongwith an upset win over Barca in the next round, may enable the Gunners win the current UCL, as they shall keep Fabregas, till the beginning of next season at the very least.