Juan,
think you might find that Britain makes up far more than 1% of the mtb buying public
totally agree with original post, an mtb should be fit for purpose as all products should be and this covers ALL riding conditions (I work for an Indian owned British car manufacturer and the expensive testing and development work we have to do so we can sell 12 cars in some obscure country is unbelievable)
Bottom brackets are not, in my opinion, a disposable part
I think that we as consumers should be entitled to better than we recieve from some companies, especially since the enormous price hikes seen in the last 12 months (our cars haven't increased in price anywhere near as much as the bike components and we use the same aluminium, carbon, magnesium etc raw materials and are subject to the same currency fluctuations)
Must balance this with a pat on the back for those companies that do offer good warranty and back it up by honouring those warranties when required.