I don't think we can look at history as a guide to whether or not you can play with two good keepers. Things change and most teams will have very rarely had two keepers on similar or equal footing.
There's going to be 10 games in the CL group stage alone from next season. Both could in theory play 30+ games each if rotated regularly - never mind if one gets injured or even loses form.
Time will tell if we can keep both happy, but I guarantee that if they both get a decent amount of game time it will not be easy to leave if we're among the best 2-3 teams in Europe.