Glas as unique resource would work nicely together with the fact that the trade-route benefit is calculated (among other things) due to resource-diversity. Venice would own more beneficial traderoutes in addition to having access to an unique luxury. Nice touch!
Aside from this, I really don't know why so many people refer to the "unknown resource" as luxury. This was never mentioned! All we know is, that there will be one new resource - it might be a luxury, it might be a bonus resource. We don't know!
Aside from this, I really don't know why so many people refer to the "unknown resource" as luxury. This was never mentioned! All we know is, that there will be one new resource - it might be a luxury, it might be a bonus resource. We don't know!