They haven't locked you out of anything. The Nightfall and Weekly this week are both from DLC content and if you don't have the DLC you don't have access to that content. When they switch the Nightfall and Weekly to something from the original game it will no longer be locked to you.

Name a non-subscription game where an event you did prior to an expansion was removed from ONLY non-expansion players. I'm not talking about an overhaul that changed an aspect of the game for everyone, this changed only for people who did not pay more money. I have no problems not playing anything in the DLC, but I do have issue when something included in the base game is removed. Almost every game I own, no matter how many post-production updates came out, is playable as it was the day I purchased. There is no replay value outside of the daily/weekly events after you complete the story, and those events are not available right now without the xpac. It is one thing to tease pretty items and say, "opt in if you want these new things." It is another thing to lock something you have been doing since day 1 and say, "opt in if you want to continue what you have already been doing." What if you bought a new car, and next year when the new model comes out they ask you to upgrade or you can't use the roads for week? Those dirt roads we used back in the day (story mode) is still usable, but that paved road you used to get to work and the store yesterday, sorry. Temporary or not, that is most definitely a "lock out."