Because a lot of people sent asks on the subject:

The above is from the Capcom Integrated Report 2017 (released on 16 February 2018), which can be found here. Or if you just want to go straight to the Digital Contents section of the report, you can find it online here. According to the report, “sales of Dragons Dogma Online (DDON) were on track.” However, licensing revenue downturn from MHO has affected the net sales for all their online titles. Amortization (allocating the costs over a period of time; for DDON, this is because the game is updated in Seasons) for DDON and other titles have gone up. (No surprise, as costs go up each year, and licensing fees/royalties of other popular series/titles due to collaborations etc.) There is mention of ‘loss of valuation for some titles’, but DDON is not mentioned here, so it’s highly likely the game isn’t one of those titles. As for the outlook for the 2018 fiscal year, it states that Capcom will continue to improve its revenue base through ongoing updates to its existing titles such as MHFZ, DDON and MHO and reducing overhead by streamlining management. It has no intention of dropping any online title; it is simply adopting strategies to reduce loss for all of its online titles, which is typical management strategy anyway.

TL;DR: the game is doing decently enough and Capcom has no plans of dropping it.