Model-Based Systems Engineering (MBSE) has been challenged concerning its successful adoption in real-world applications. Although MBSE remains to be the focal point of any systems engineering activities, its adoption still faces significant hurdles to demonstrate its return on investment. This paper presents the results of a survey on MBSE adoption challenges. Based on our research and industrial work, we first identified a set of MBSE adoption challenges and then asked, through an online survey, participants to collect the opinion concerning these challenges, what phase of MBSE adoption they occur in, and the dependencies between them. With this contribution, we aim to trigger the MBSE and INCOSE community for further discussions and industrial feedback to help in understanding and measuring the challenge space of MBSE adoption. In this way, appropriate solutions could be sought to overcome the existing challenges.