There are three very sound reasons to stock up, even if you disregard opinions about aging:
(1) price increases, almost baked in the cake due to cost of compliance with FDA rules, in addition to the states and feds insatiable desire for revenue;
(2) the strong possibility of interstate sales bans, the likelihood only increased by RYO products masquerading as pipe tobacco (This is seen as a real problem by the state level bureucrats who benefit from the revenues they get from the cigarette Master Settlement Agreement;
(3) Decisions by large conglomerates to leave the business because of the increasing regulatory burden for a declining market, as here, which will also have an impact on smaller participants, many (most?) of whom buy their ingredients from larger players (pipe tobacco has pretty much always been a factory product)
All that said,I would take this thread with a grain of salt as far as the US presence of Dunhill is concerned. They are quite capable of making different decisions about different markets. It may well be the case that, say, five years from now you can find Dunhill on the shelf and not McClelland or C&D. To the extent I feel the need to stock up(age and health are a factor), I am trying to diversify.