The investment into parks around that region consisting of Belgium, Netherlands, and Germany is clearly what can happen if different parks in the area are ran by different companies.
In the past few years as well as Walibi Belgiums additions we've seen/seeing
Plopsaland De Panne - Heidi the ride, Time Traveller xtreme spinner
Bobbiejaanland - Fury
Efteling - Baron, Symbolica, Max + Moritz, another coaster stuck in planning limbo
Toverland - Avalon and Port Laguna expansions
Walibi Holland - Lost Gravity, Untamed
Phantasialand - Taron, Fly
Movie Park Germany - Star Trek, New Intamin coaster