I forsee Kipchoge going for the WR at either tokyo or london. I personally think that with the longer preperation between those two and berlin than the gap between Berlin and Breaking 2 will lead to him breaking it then. Berlin will probably be his next marathon afterward, which it's a bit early to speculate on. I would love to see him run Rotterram or Frankfurt, as those are two very fast course that don't get many big names anymore. After Berlin 2018, I think Kipchoge will probably wrap up his career, but who knows? Kipsang has gone on for 13 marathon and is still challenging the WR.
Now to talk about Adola. Yes history has shown that most fast debuts never run faster, but Dennis Kimetto had the fastest legal debut prior to Adola's run, and he had a pretty good 3 year run. In fact, lets look at the fastest debuts without Dubai( which always seems to have random ethopians run 1 superfast race their then disappear, I persoannly think this is by far the worlds fastest course) and 2011 boston for obvious reasons.
Athlete. Debut. Second. Pb
1. Guye Adola 2:03:46. N/A. 2:03:46
2. Dennis Kimmetto 2:04:16 2:06:50 2:02:57
3. Kenenisa Bekele 2:05:04 2:05:51 2:03:03
4. Tilahun Regassa 2:05:27 2:05:38 2:05:27
5. Eliud Kipchoge 2:05:30 2:04:05 2:03:05
Of these athletes, 3 of them have improved their PB since then.
I don't think Adola is the next big thing, but I'm not going to write him off completely just because LRC released a statistic and concluded that he would most likely be a nobody without analysing the data closer. Maybe he will be the next Dennis Kimmetto, maybe he fades in obscurity, or maybe he puts together a decent string of 2:03s-2:04s before buring out.