The bottom line is today there are a lot of options, so I would encourage you to to take a little longer to make the decision.
Each product has it's pro's and con's. Possibly write up a short list of pro's and con's for the various "ways" you can go.
What is great to see is the battery powered market moving to take ADVANTAGE of all the DCC compatible hardware out there, it gives you more choices, and of course there's competition when YOU get to be the person making the choice.
A couple of clarifying comments: DCC is not just for advanced motor control for small scales, but it has a huge range of features. Whether you need them is your decision, but for example, running servos to animate things on a loco, couplers, hoppers that can dump, that's really easy. Extra lighting effects, multiple loco control, perfect matching of locos running together, there is a lot.
I use a lot of consisting, so the DCC features to do this are important to me, for example.
This is not to talk down a niche product like the Revolution, it does fill a unique niche, passable sound, and pretty advanced features over a simple remote with motor and direction control. For the money it is a great deal, but you have to realize you have locked yourself into the features it provides today, and hope that additional sounds will happen, and support will continue. It's a great choice for many people.
AirWire used to lock you into just their motor control and sort of a crippled interface to a DCC sound card, which also made the entire system more expensive. With the advent of the Convertr, this has improved the situation significantly in my opinion, giving you more flexibility in choices.
Lastly, "deadrail" has a number of things going for it, and is a similar setup to AirWire when using DCC motor/sound decoders. It is a bit different in that you have to provide your own DCC system and throttles. In some cases this is a huge boon, in others, AirWire might be a better choice.
So while not a lot of new rolling stock is being developed, we are certainly benefiting from the increased number of choices in electronics, albeit sometimes somewhat confusing.