From my layman’s view, I think this is a good idea, you don’t want to restrain capital and (does it have to be always mandatory) expertise inflow.
“Receiving more contributions than we can deploy for 12-18 months” => is a good point.
The 4 major pitfalls in my opinion for this are:
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Governance issues.
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Diluting or giving the impression to dilute the token with new tokens.
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Be absolutely certain about the Lockup period and a yearly allowance (see Jed McCaleb and Ripple).
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Regulatory clarity (securities).