It seems that BTC.D is already in a downtrend towards 48%. The Dominance Dip along with sideways movement implies a significant pump for altcoins or a small 'alt-rally' before BTC makes significant movements from the 32K region.
Also, it is likely that the BTC.D may bounce back to 56% after that. This may be, because (1) BTC continues to move upwards (2) Another possibility is the breakdown towards the 20K region and alts bleed.
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So, I think it's better to close altcoin-LONGs when the retracement completes or BTC.D reaches around 49%