That's a very general question with no right or wrong answer, Jamie. It really boils down to what are you looking out of dating. If you're looking for a long-term relationship leading to marriage, yes it's hard, but it's supposed to be. You're looking for someone you can share everything about you, who will accept you as such, and who feels the same about you as you do about them. That's very difficult and while it can take time to find that person, it also takes time to find out if that person is the person you want to spend the rest of your life with. This is true whether you are ABDL or not.
But if you mean it in the sense of "is it hard for ABDLs to find dates", then that depends on the ABDL in question. Are they only dating to find a mommy or are they dating hoping to find someone that they can be with, but at the same time may or may not want to be part of their ABDL time? I will say without hesitation that continuous selfishness is a very unattractive quality and if anyone dates exclusively to find a mommy or a daddy, they will have a very hard time keeping that relationship going if they are doing nothing to reciprocate the attention and time their little side is being given. At the same time, if you do find someone, but they do not want to baby you, you need to talk about what you can do instead, if they are okay with you participating in "little time" by yourself or if there is any capacity that they would want to participate as well. This requires communication, and you will only find someone right for you if you communicate.
There's so much more I could say, but it would help if you could be more specific with what you mean by your question, Jamie.