I don't think the attendance at the draft is a big deal. Orlando had the better draft pick after all; there's always a lot more excitement when you have the first overall pick then the second. this is even more true in our case when NYCFC deliberately passed on the pick.
Don't forget NYCFC has already asked all the TR folks to take off to see the new jersey. There's only so many times people can take off.
What I'd recommend is if TR goes again and wants more turnout is to make it more of an event: TR just sold it as "come to the superdraft on a bus." Instead, TR needs to sell members on an experience: Go the night before, hang out with TR people in Philly, maybe put on a mini Q&A with an exec from the club, Meet the new draft pick(s) etc.
Make people know that if they go, they're not just seeing in person what they could see on a live stream and you'll get a better turnout.