Have been a buyer of Acer laptops for years and now android tablets, I believe in the brand and hope that they will continue to roll out updates for their products. The tablet market is fiercely competitive and Acer have to look after their customers.
Do you do the same thing with your phones (sell it and swear off the vendor) when they stop doing upgraded OS versions after about a year? My Motorola Bionic is stuck with Jelly Bean and that is well over a year old, yet I'm not going to swear off Motorola because of it... It's costs a lot of money and resources to do an upgrade, with no payback when done on an older model.