I don't necessarily think that they are becoming the new TAG, it's more a case of TAG realigning itself in the market, almost becoming the new Omega.
TAG seem to have improved their QC, and with some handsome new and aspirational models, and a move away from what was once a predominently quartz range, they seem to be having some success.
A few years ago, I wouldn't really have wanted any of the watches in the TAG range, but there are one or two that might tempt me.
Watches for most people are either a necessity, or a purchase driven by what they perceive to be fashionable. Those who are not WIS or watch aware will buy the one that attracts them most, which is still, at least I'm pretty certain is still, Omega, because of their reputation and history. They once would probably have bought TAG, because of the price advantage, but now that TAG has started to trade on quality again rather than fashion, their prices have risen to Omega level, and potential buyers faced with the choice of similar models at similar prices have started to go for Omega instead.