For a portable setup it could be nice to have relays, but like Obiwanjacobi said, would 2 be enough?
Currently I use a midi switcher, and switch 7 functions in my amp, so 7 relays would be ideal for me, but in a couple of months someone else comes and wants to switch 8 functions, so you're lost again.
For me the external switcher is not a real problem rackspace wise. And if it would be, it could also be integrated in the amp.
I can think of several other modifications I would like to have instead of the switching relays, but commercially, if a couple of relays can be added for people that have a 2 channel amp or something, costing less than a dedicated midi switcher....who knows!