The GT 1030 is actually in the same ballpark as the GTX 560 Ti in terms of performance - at worst (in old DX9 games) it'll be a very close match for the 560 Ti. In newer DX12 and Vulkan games you're going to see up to 50% improvements, especially when it comes to minimum framerates and overall consistency.
The only reason to get one would be that you are after something low-noise and low power - there are passively cooled options that I would highly recommend for this role, and also as ideal drop-ins for computers with ageing power supplies that you're not so sure about and don't have the motivation to replace the PSU in.
The sweet spot for gaming right now is probably a 1060 3GB since this is around 20% more expensive than a 1050Ti but offers around 40% more performance. Anything more expensive than this (ie, has 4+ GB of VRAM) is going to be overpriced due to the crypocurrency mining demand. There's little point buying a faster card than the 1030 unless you actually have plans for AAA gaming at 1080p resolutions. The 1030 will be adequate for even modern games if you're happy with 1080p30 at good details or 60fps achievable if you drop the resolution to 720p. At any rate, Games like CS:S and L4D2 run fine on a potato like the GT 710 - and the GT1030 is easily 4x the card that the horrid old Kepler-based 710 is.Here's a link to a bunch of popular modern games running on a GT 1030 and a lowly i3
There's nothing new coming for a while at the GT1030's range, since it's the latest Pascal silicon and Volta will probably launch in the order of "Quadro compute", then High-end, then mainstream, and then maybe even skip the low-end like Maxwell sort of did (the 1st gen Maxwell 750Ti didn't get a refresh for the 900-series, it was just relablelled a lot for laptops and entry-level OEM cards). The AMD alternative to the GT1030 is the RX 550 and it's similar in performance but not available in a passively-cooled option and also around $20 more expensive.