Who knows where prices are going? But with regard to stockpiling, someone whose tastes are still evolving has a bit of a problem hedging against the future.
One strategy would be to go to TobaccoReviews.com's search page and search for 4-star blends that have a lot of reviews. Then at least, you know that a consensus exists, and that a lot of people found a particular blend worthwhile. Read the descriptions and sort them out into broad categories like: Aromatic, English, Scottish, Balkan, American, etc.; then buy-up representative tins.
Another strategy would employ the same searching, but sort them out into tobacco varieties like: Virginia types, Burleys, Vapers, Orientals, Latakia-laced, Perique-laced, aromatics, or top-dressed. Again, try to buy representative blends.
Most brands try to cover everybody's tastes, so you can buy "one-of-each" of the offerings from Cornell & Diehl, GLPease, Hearth & Home, Two Friends, McClelland, Stokkebye, Rattray's (and dozens more!) -- but you're looking at a huge investment of capital. Fortunately tinned and jarred tobacco will stay viable for decades; and a $1000 cellar today would be worth $7000 in the purported future.
Chances are if you diversify, your evolving sense of taste will, with time, lead you through all the varieties you have purchased; and sooner or later your taste buds will "come around." Also note that the elusive "perfect-for-me" blend doesn't exist for very long anyway. Like women, no matter how sexy and hot, you'll always hanker for a little "strange", IYKWIM
Well, that's my 2¢ worth. I'm eager to hear how others would deal with the issue.