Funding - need for training; depends on the threat. Theoretical or practical, where is the evidenced based assessment of likely outcome. TCAS most likely, but the report appears not to have considered the complete system or actual / realistic conflicts.
Dual TCAS; anyone recall 'Two TCAS North of Darwin' mentality.
The industry resorts to training far too often - the universal solution, often without the required thought or justification. Focus safety on the overall operational environment, start with the hardware; only use training for the proven high risk threats without technical solution.
Considering the 'big picture', what type of deviation could occur; context, situation, location.
What other aircraft systems might mitigate any threat.
What did the industry do before GPWS, TCAS; there were accidents, but check/compare risk, context, situation, etc.
Training; no, not justified.
Better to inform pilots and regulators that “The only thing we have to fear is fear itself.” - Avoiding danger is no safer in the long run than outright exposure.
How many instances of crews failing to follow valid alerts; and that's after training !