Not unexpected, but the inability to purchase DLC is a pain
I had a bit of a last minute purchase rush earlier this year when the Wii U eShop closed for new purchases. The one thing that is rather annoying is the inability to purchase DLC, so whilst you've already purchased the game, or subsequently obtained it on physical media you may be missing notable sections of content.
I'm pretty happy I obtained everything I reasonably wanted to, but it is a problem for anyone looking to collect in future years, piracy is the only option to obtain some DLC.
To be fair to Microsoft, backwards compatibility of 360 games on an XBox One is good enough that I've not bothered considering a 360 for the few games that need a real 360. The number of XBox Live only games appears to be even fewer, there's Bangai-O HD : Missile Fury which is a little too bullet hell for me, and Prince of Persia classic later reached other platforms. Will have to do a search to see if it's worth bothering buying a system prior to the shutdown.