Yes traxia can stand on its own. If traxia plan and develope a good strategy that can gather investors easily. Advertising and promoting will also help this project to grow big.
It is already gaining a lot of attention but not that much in compared to the supporters of Cardano. If they can get at least 5% of the market cap of it then the funding for this project won't be a problem.
Well its not possible traxia will be famous like Cardano hub. Since they are now partners im sure cardano will do everything to make this traxia project a succesfull one. Whatever achievement of traxia both parties will be benefited. But still a good advertisement and promotion strategies will help traxia to be successful soon.
I don't think any large additional advertisement is required. Being associated with Cardano is already huge in itself and a lot of people get aware of TRAXIA exactly because of that existing relationship.
Even of traxia is a new project they are still doing their best to increase their exposures. I hope that they will still improve their marketing and advertising strategy to gain more popularity.