No Question that the survival pod takes up a large amount of deck space. it is overwhelming on the Nordhavn 47. If I put a pod on a boat, I probably would make a Sumbrella cover for it when in port. The boat which Milt asked about is a 60 footer. Also in the post from 2002, I mention what are negatives to this system.
Pods are utalized on Oil rigs, cruise ships and commercial shipping. Most of these have a gravity launch system.
I suspect that one would be highly motivated to get a 250 lb object off the deck if the boat was burning--it would require that the lashing be released--and the boat pushed over the side. On the other hand if the boat is burning--the life raft may have gone up in flames--so perhaps the point is moot.
Fortunately rescue seems to be fairly rapid with a GPS equipted EPRIB and AMVER system. http://www.msa.govt.nz/Search&Rescue/amver.htm
Bob Austin