EUR/USD Trending down

Where will the present downtrend of the EUR/USD end? Looking at the long-term chart (since 1990), whichever line we take (A or B) as the Support Line, the downtrend has a long way to go yet: probably as far as $1.3022 at least. What could abort the downtrend in the meantime? A reversal of policy of the ECB; worse than expected performance of the US economy with extension of quantitive easing, or better than expected financial peormance in Europe.