Game development is SLOW.
Multi-GPU is going to get better, however we aren't going to get to 2017 and suddenly everything works perfectly.
We'll continue to see some games with no support, some with DELAYED support (not available on launch) and games which supports it but has issues.
Other:
Don't forget about the computer MONITOR. I personally would much rather have a good GSYNC monitor with a single GTX980Ti (or similar/faster Pascal card) rather than a non-GSYNC monitor but 2x980Ti.
GSYNC is still expensive though. I'm also trying to decide whether to go with ULTRAWIDE (21:9) such as a 3440x1440 monitor instead of 2560x1440 monitor.
Do note that 4K is not currently ideal for gaming monitors because you can't get a very high refresh rate. Nor would I run games at 4K anyway since 2560x1440 requires a lot less processing power and usually looks identical.
CIV5 has really small text and it's quite readable at 2560x1440 so I'm not too sold on 4K, and of course 4K has scaling issues with some programs (so does 1440p as it gets worse the higher the resolution).
We may see 4K solve its bandwidth issues at some point via dual card inputs (so 120Hz/120FPS?) so I'm not ruling it out, just be aware of the pros and cons.
Anyway, here's MY plan for upgrading:
2016/17-> Pascal (1.25X or higher perf than GTX980Ti, 8GB VRAM)
- passthrough HDMI/DP for VR? (EVGA has one like this to connect HUD to front of PC... permanently attached with a SWITCH would be nice though)
2017/18-> GSYNC monitor. Specs like:
a) GSYNC
b) 144Hz (2560x1440), or 100Hz (3440x1440)
c) IPS (possibly Quantum Dot version)
d) 4ms or lower refresh rate
e) HDR
f) QUALITY, plus good Warranty