Those that don't want to increase it now are siding with the core dev/blockstream guys
and support their plans and ideas.
Everyone else is calling for an increase in the short term.
Well, it's impossible for an "increase it now", this isn't like upgrading a server running Apache and mySQL, people have to update their nodes, people all around the world, it takes a few months for this to happen, so any changes that require upgrade have to be planned way before they are supposed to be in effect.
there was an emergency fork once (altho it was clearly necessary and there was no disagreement ) took only a few hours for most miners to update.
this isn't even the point. increase now = as soon as we can. we're not increasing it now because not everyone agrees.
And a solution is yet to be found.
https://github.com/bitcoin/bips/blob/master/bip-0101.mediawiki