I have been thinking about this for some time now and have discussed this matter with a few people I work with every now and again.
We all currently still favour Evo for its simplicity and end-user friendliness, but are aware of its age and that technology doesn't wait.
The one major problem we are all running into is when clients ask for updates - I have told my clients the situation and they are all OK with this, but also wonder what the future will bring.
The community developers who took over the development of Evo are doing and have been doing a great job, in my opinion they have kept Evo from falling away.
I have tried to help where I can with testing and reporting possible errors / bugs, which have all in turn since been fixed
To get to the point:
I am well aware of the fact that Evo is nowadays in the minority, I don't have hardcore facts but I would still lean out of the window and say multiple thousands are still using it on old and new sites.
We are all in the same boat when it comes to the future of our Evo sites, including those who use both Evo and Revo.
The future sees the deprecation of the "mysql" extension in PHP 5.5+, meaning Evo won't work or won't work correctly (please forgive me if this statement is not 100% correct, I am a front-end designer/developer, not back-end, PHP and database is not a language I speak

)
Jako mentioned in one of his replies on a different post in the forum that "All db access have to be changed to mysqli" for Evo to work with PHP 5.5+
So far as I am aware, this is quite a challenge and won't happen overnight if at all.
Which brings me to the point where I ask:
Is there still a future with Evo ?
Are there modifications currently being made to future-proof Evo or will it be passed over in the near future ?
Is it worth moving from Evo to Revo or would it be better to wait until MODX 3 is released ?