More than before. Sure, some manufacturers will prefer to update only their flagships, but that won't be a problem for long. Treble doesn't force OEMs to update

More than before. Sure, some manufacturers will prefer to update only their flagships, but that won't be a problem for long. Treble doesn't force OEMs to update - it simply makes updating take less time and resources of the OEM. Now that its cheap, some OEMs have the capability to update their entire stable of devices, incentivizing the other OEMs to follow suit. Of course, it'll take some time for this to materialize, but in the meanwhile, installing ROMs becomes much easier.