I think tape will be around for a while if only because the Pro models still use it . However you are right they are fewer and tape has been marketed as old and obsolete to give the newer models a marketing boost
As such backup strategies may be called for.
Saying that, the Hi def HDD camcorders use a format which may itself be obsolete in the future or not

If they are backed up onto HDD ( which can crash fail) or DVDs (which are not robust in the long term ) then what?
I dont think there is any easy solution