That is exactly what the promise of the Spirit is in the New Covenant. Not only would believers be indwelt by the Spirit, but all would have the Spirit poured out upon them. And not just Jews, but all flesh, meaning all nations. There are no ethnic barriers to receiving the Holy Spirit. To reinforce this fact, Joel continues by stating that both sons and daughters would receive, showing no gender barrier. And he says old men and young men would both receive, showing no age barrier. Even servants and slaves would receive the Spirit, which meant no economic or social barriers. In the New Covenant we would have one great Mediator, and He has promised to pour out the Holy Spirit on all who believe.