Will it? My level of doubt is high. There is very little recourse if the company decides to cease operations, which I think they will in the near future.

I think they could easily argue successfully that post-sale software updates were always contingent on continuing operation of the company.

Phone != The OS

After two years your battery will be almost unusable so genuinely it doesn't matter.

My only issue with oneplus phones, and I owned several of them already, is that they are running incredibly hot on normal usage, and battery capacity detoriates quickly over time.

They do have a great sleek UI and great hardware, not to mention fantastic supercharging capabilities which is a life saver sometimes, but all under the big cost.