This has always, until the past year or so, been my opinion too. But most of the interesting independent labels have seemed lately to devote an ever greater share of their production to re-releases and to new releases of the more mainstream "tried and true" repertoire.
I'm not sure you're right on the re-releases, but I think the independents are probably doing more mainstream repertoire all right.
But it's a question of interpretation. It could be regarded as a sign that the independents are increasingly confident that their recordings of mainstream repertoire have nothing to fear from comparison with long-established rivals on the majors.
Or a question of personal perspective. You might feel disappointed in this change, but for my own part, I'm quite pleased to see top-notch mainstream material from my favourite labels right now, because I like buying new recordings but also want to ensure I stay in touch with the standards.