It's not a strawman argument. Will you or will you not be a GT fan if conferences go national? It's a question ALL fanbases will have to ask themselves. Whether you like it or not, if you quit following college sports, there will be a 10 year old who only knows college sports the way it will be and he/she will grow up supporting whatever team was on that afternoon during his childhood. That's how I essentially became a GT fan...I passively followed Michigan (from Royal Oak, MI) and Notre Dame because they were always on TV. I fell in love with GT because they were a local team having a great season in both football and basketball in 1990. Whether you or I like it or not, we are replaceable. There are MANY other fans that will fall in love with the fact that there's a conference playing all over the country.
GT/ACC is already relegated to streaming or the ACC Network 4th and 5th rated production team. How many games have we had to watch on streaming only? Have you quit watching GT or college sports?
In terms of "take away that shot", you must have missed the last decade of college sports. You're arguing something that exists right now. Someone did a study of how many schools have a realistic shot at the playoffs or national championship. The reality is there's probably a dozen teams right now with a realistic shot of the playing in the playoffs or national championship. Sure, there are some teams that sneak in from time to time (Cincinnatti, TCU), but look at the vast majority of playoff and national championship participants. It's almost a closed circle.
Besides, if anything, there will be MORE access in the future. 12 playoff spots in the future, so you can argue it may be EASIER for schools outside of the future Big 3 in making the playoffs.
One day, there will be generations who only know national conferences. Guys like us who grew up with regional conferences will be "aged out". This move to consolidate teams and conferences is a 50+ year decision. Whether you and I like it or not, I highly doubt fans from our generation (I'm in my 40's) will factor much into network decisions over the next decade or so.