I'm personally a huyge fan of giving nobles a reason to become attached to their estates. Right now, if you're removed by your lord or something else drives you from what SHOULD be considered your home, most just shrug it off. If you've put time and investment into it, I believe most will actually do something about it. Be it conflict between knights and lords or being more fervent in war.
Yes. Knights don't give a damn about losing their estates at the moment. It is not like they can't take it again :p. Give knights a way to invest in their regions will surely make them get attached more to their estates. They should act more desperately and feel frustrated when their regions are under assault, not shrug and get another estate to serve.
