The keeper situation has always been exaggerated because of the shit defence. Sort out the defence and having an average keeper (what I think Chesney is atm) won't be a huge issue. Improve the attack and conceding goals won't be as costly.
One wouldn't be overstating the importance of cech,van de sar,valdes,cassillas etc. to their teams though? In my opinion Gomes was the difference between us and the spuds this season.