The advantage of this change would be that the proceedings (of LIPIcs) will have open access which is in line with the concept of academic freedom, allowing students and faculty from universities who do not have access to LNCS to read all CPM papers in the future. Moreover, according to Maxime Crochemore, there are funding agencies who require free access to articles. 

The disadvantage is the cost. Until this year (inclusive) the cost of LIPIcs was (and is) 15 Euros per published paper. However, they intend to raise this (gradually) to 60 Euros in 2019. For LNCS the charge is per book ordered, where the first 50 copies are free. Historically, for CPM conferences the charge for extra books has been 500-1000 Euros. However, at 60 Euros per article and roughly 30 articles per CPM, the LIPIcs cost will be around 2000 Euros. This might cause an increase of 20-30 Euros in registration fees in future CPMs. The LIPIcs management expects a five year commitment (which makes sense) on the behalf of CPM.

The steering committee, Maxime Crochemore and Zvi Galil, support the move to LIPIcs. We, the PC chairs of the upcoming CPM, Roberto Grossi and myself, support the move to LIPIcs. The audience at the CPM 2015 business meeting also strongly supported the move, but wanted to know the costs. 

Hence, if you oppose this change, now is the time to raise your objections. Otherwise, we will go ahead and move to LIPIcs already this year.

Best,

Moshe