That's a difficult question, one of many President Obama is facing in the early months of his administration--how to deal with Iran, Palestine, Pakistan, Afghanistan, North Korea, the recession, not to mention health care reform.
I'm not sure what the answer to your question is. I lean toward not sending more troops until our objectives are more clearly defined, and the cost in lives and money of attaining them, how long it will take, what the likelihood of attaining them is and what other alternatives are under consideration are clarified. One of the most worrisome concerns is what the implications for Pakistan would be if we bailed out of Afghanistan. It may be that the current non-sectarian government may be driven out by religious fanatics who would foment more trouble or war with India. The group that sent the terrorists to attack Mumbai, Lashkar e Taiba, is still functioning in Pakistan according to this morning's NY Times.