Bath's logic is one I've expressed before and can definitely see the point in, but there's also the argument that keeping a 'keeper as good as Ruddy could be very useful. Marshall is perhaps the only 'keeper in the league who could rival him for quality, and he's more likely to move on. Should we get promoted again, having Ruddy means we're definitely not going to need a new 'keeper right away, and the understanding between a 'keeper and defence is important in any league.
Rudd, or even Bunn could do a job in the league, but Ruddy could earn us several points over an average championship keeper. If wages permit, I'd rather we kept Ruddy and Bunn, two senior keepers should be sufficient, with Nash only kept if his contribution to the coaching side of things is significant.
I'd like to see Rudd loaned out again so he can continue to develop. Ideally that would be to Preston in the championship as he's settled there, but if they don't make it through the play-offs then perhaps a loan to a club at the bottom of the championship would be more beneficial.