I'm personally not a fan of the current 5-issue arc model as I feel it constrains writers. That's how books are approved now, in increments of 5 issues (sometimes 6). So a writer has to write an arc that either can serve as an ending to the book or can continue. It seems with the X-books it's not really working because we have several stops and relaunches, and now a movement into a majority of minis. Al Ewing mentioned that he ended Red #5 with Magneto keeping himself alive with his chest wide open as somewhat of an insurance policy to guarantee they got another 5 issues. It just seems to me that they're pivoting towards minis because the above model is struggling.
Thompson's run is legendary in this era of the industry. After the final issue is released, X-Force will then be the longest-running title at Marvel. (Outside of maybe Star Wars stuff as I'm not familiar with that world.)