As much as I'd love a GE and to see Tory MPs swept from power en-masse, that's just not how a Parliamentary system works. Everyone in the UK voted for (whether they think it or not) an MP to elect them for five years. Those MPs get to choose who leads them.
I think there is a very high chance they will be unable to agree on a new leader and will therefor be unable to form a government. Even if they do elect a new leader, if that leader can barely control the party that would not a functioning government, and they should call an election.
At some point Tory MPs need to grow some, call an election, and except that it may mean loosing their job.