In the idea that Ryzen's performance really is that good. he big question is: will AMD go down the price/performance?
AMD has not set the final prices for Ryzen chips yet, though it is highly unlikely they will vary much from their Kaby Lake competitor models. Sadly a SR7 for $200 seems quite unlikely.
if you are looking to upgrade to Ryzen, you can start with sme DDR4 memory. Then when the CPU is available you can get a motherboard and CPU.