Either I don't understand what you're talking about, or you don't understand how the market works - and I'm leaning for the 2nd option. For marketing to have something to show off and plan on, you have to have the actual HW (phone, that is) in the final readiness stage, which means that the HW has been developed for at least 1/2 year ahead of that time. 1 year from CPU manufacturing to phone sales is very good, 9 months is INCREDIBLY OUTSTANDING. Having the CPU ready at point X in time doesn't mean it can be used at that point - it means it can be used at the very least 9 months from that point. There are NO other phones and NOTHING to choose from 9 months ago - but the 2 choices you see now. The only other choice would be to skip international phone launch and wait until either T3+LTE modem combo of some kind is made functional (which could be already done, but we're talking 9 months time ahead, yes?), or to wait until Qualcomm prepares its quad-core for phones (which could also be already done, but again, 9 months ago it wasn't). So, let's see, what would you choose - participate in worldwide launch and use an equally powerful (if not even more powerful) version of the phone sporting LTE support to boot, which nobody else gets, or skip the launch. Oh well, let me think, a very hard choice, is it.
What also causes me to doubt you know what you're talking about, is the fact that Snapdragon-based phones have been around Android since Jan 2010 (Nexus One), and Tegra chipset saw first wide use only in its 2nd version, in Jan 2011 (Optimus 2X), a year later, and a couple more months till it was officially available in US. So it's actually 2 years of VERY widespread use for Snapdragon vs 1 year of spotty use (more tablets than phones - barely 2 phones or so, Atrix and Optimux 2X) for Tegra 2. Just the opposite of what you wrote.
For having smart discussions, there is a small prerequisite - both sides should know what they're talking about quite well. On this board, such a situation is rarely encountered. So sometimes it's better that people don't just run here posting everything they saw somewhere on the internet - especially if it's a 2nd-grade non-professional article in "business" section of some newspaper, and not a professional analysis article on one of the dedicated HW and Android-related sites.