I'm a bit concerned about the quality of hardware - not from the current contenders specifically, but historically there are generally companies that make subpar hardware to undercut their competitors, like for example when Apple decided to let other companies make Apple hardware, there were a lot of clones that had issues, devaluing the brand and it almost tanked Apple. Similarly, the amount of garbage software for the Atari almost ruined the industry before Nintendo saved it specifically by having a closed platform so they could ensure some level of quality. With the Internet as prevalent as it is now though, it's a lot easier to research something before buying.
I guess it's sort of a push for these "indie" consoles, since they're all pretty under-powered in relation to what we get from the Big 3 (Nintendo, MS, Sony).
All these companies joining in also means that it's likely that we'll get a platform that is being updated whenever new technology is available rather than once every 5 years or so. Honestly, I think a regularly updated video game platform might be the thing the industry needs. It works great for iOS and pc - why not consoles?
The general consensus has always been that PC gamers are more sophisticated than console gamers, and therefore understand that gaming technology is a perpetual investment. Console gamers on the other hand tend to expect that what they buy today lasts for the next 5-7 years without the need to pay for upgrades.
Some people refute the latter claim by pointing out system upgrades like the Sega CD and Sega 32X, but I always remind them that both of those systems (especially the 32X) where commercially unsuccessful overall, and it showed us that consumers are not keen on buying full-scale hardware add-ons. However, if the price of add-ons can be kept close to the current cost of a AAA retail game somehow, this issue may then be moot. It's just that at the time that add-ons like CD systems and such were common (16-Bit era) they were always as or more expensive than the main console.