Why? Same reason the repeal of prohibition was not good for bootleggers. Once mj is legal throughout the US the schedule 1 license won't be required by others taking any exclusivity pmcb may have (through UNC) away.
"The University of Northern Colorado (UNC), successfully obtained a Schedule 1 license from the U.S. Drug Enforcement Agency or the DEA. How can PharmaCyte Biotech benefit from UNC being granted this license? The license puts Pharmacyte Biotech and UNC into an elite group of U.S. researchers. With the ability to obtain government-approved Cannabis, work can now advance. "