The issue is relatively narrower than that, a little.
For all real intents and purposes, when you're buying boutique puerh, and you're seriously thinking about long term aging--more than a decade or so, then the best chance of success essentially lies with Bada, Bulang, Nannuo/Hekai/Pasha, Youle, and Guafengzhai. High elevation puerh from lower lattitude, made with broadleaf. Do not cheap out. Check online what the broad prices are for each area, and sample the teas likely to be real.
Moreover, for the most part, you shouldn't expect modern blended tea to perform as well as the good teas from the '80s or '90s. There is basically no relationship, for example, between the 2001 Simplified Yun 7542/'03 Jin Dayi/etc and anything after 2005. All of the potency you're going to get from aging most modern Dayi will be from sheer age of the leaves--they'll age into something like the '90s little yellow mark. This doesn't mean that it's not worth it to age such teas, but boy oh boy, the leaf in them older teas were quite abit better.
The issue is pretty similar with single area teas. It is simply not a casual affair to get the good stuff from the places that people are sure will age well. The margins for the traders are terrible, too. This has led to hyping of teas from other areas, particularly lincang. The real problem with this philosophy for the consumer is that the good lincang and lancang groves, outside of Jingmai, simply do not produce much puerh, relative to 'Banna. So people are mostly buying fake Bingdao and fake Xigui, with leaves from other groves that don't cost nearly as much. The northern tea with the best track record for aging appears to be Fengqing DaXueShan (if you don't consider various Xiaguan, because you don't know where any one product is from). Honestly, there is a better publicized track record for those weird wild leaf cakes than there is for Bingdao.
Now, will they age or not? All tea does age, the trick is whether they keep/replace flavor and aroma, developed aged body and qi. Will the Wuliang age? Probably so. Will it age better than other things? Probably not. However, by and large, such Wuliangs are cheap (if they're not one of those JingGu groves or Qianjiazhai), and they are easier to get with decent quality for Wuliangs.