To be honest half a dozen pollsters doing one poll a month is enough at this stage in the electoral cycle. I think 2010 was the exception rather than the norm, because of the novelty of a coalition and the possibility it could collapse and force a snap election.
I checked the other day and there had been 152 polls by this stage in the 2010-2015 parliament compared to 27 this time.
Populus' VI polls haven't had a sponsor since late 2012 when the Times gave up on them - they presumably carried on doing them for publicity, up to the election after which VI polls weren't such great publicity.
It appears that the Times is now using YG which would imply that News UK is consolidating with a single pollster and perhaps using them more sparingly.
The Guardian announced after the election that it wouldn't report ICM VI polls as discrete news stories for a while, and I dare say other media outlets might have followed their lead.
"I enjoyed Nick Clegg losing his seat and it also proved how clueless all these political journalists are. The barmaid knows more about politics then they do, they’re all f***ing bluffers."