Hopefully this trend keeps up for the next couple months at least, there are no guarantees. I personally think ITAs will be heavy during the first quarter to allow time during the rest of the year, to start and finish the entire process for these candidates. That way, it all takes place (or at least most of it) during 2017, and not leak over into 2018. This will allow CIC to actually hit its target during the 2017 year, and we may see the invites taper off later in the year. If we don't we'd be looking at over 120k ITAs, so I highly doubt this trend would continue throughout the year.
CIC are the only people who know exactly what the strategy is. With that said, these numbers of people leaving the pool may leave others in place to receive PNP once they re-open to beginning filling their quotas for 2017. The simple fact is that they will admitting more people than last year with the increase in quota, the exact strategy they will use to do that no-one knows, these next couple months will continue to shed light on the situation.