You can safely upgrade while also being able to access the upcoming version 11:

The link of the title is ( http://url.wolfram.com/5gyppQs/ ). Or send an email to the email mentioned above.
As Bianca said, there are quite a bunch of things added since 10 in versions 10.2/10.3/10.4, only for that it might be worthwhile for you. But with the prospect of also being able to access the upcoming 11, you might be even more willing to upgrade.