Technically you could make a game now. Just not a shooter(or not a good one), and probably not stable
But I am of the same mind as most. No point doing too much at the moment in Reloaded. I have spent hours upon hours on a few levels, only to find them fail to work on the next beta. So until we are further down the line I am no longer spending anywhere near as much time on level designing.
As to your point a game may not get finished until 2017, that's actually a fairly normal time scale for a lot of big games. Look at Duke Nukem Forever's lengthy dev time (Not that that, is normal). Matthew Smith once said, "Get enough money together to spend 6 months making a game and you will find it ends up taking 5 years." Game dev can take time even with experienced coders.
Even simple games can take time to finish and polish. We are all impatient to get cracking on something. I say if you have an actual game idea, work on it, flesh it out. Try to get as many assets made for it as you can before you start work in Reloaded. If you can have the media all done and ready by the time Reloaded is in better shape, you will have a way faster time developing the game. Also, for now, until you know what Reloaded's capable of, and also yourself of course. I would keep the design as simple as possible, with the option of complicating it down the road if possible.
Of course this is coming from someone who hates designing anything beforehand, other than the vision in his head, and likes to jump straight in with both feet! Good design though can save headaches down the road.
So take the time left for Reloaded to become more complete by getting media made, and practising with small tests, rather than grand levels for now. If your not a media maker then practice scripting possibly. Or of course wait, and try again in a few months. From all accounts the next beta should address many issues with the current one and will allow more creativity with levels. I'd still be careful how long you spend on levels that may become defunct.
I'll end it there. As I am waffling lol.