Can I be with my wife even if she can't sponsor me?

Is she has a job and is reasonably certain that she will continue to be employed, that should be enough to have the I-864 Affidavit of Support approved. It will probably take a lot of fighting with the Consulate as they always want to see tax returns. If not, file again once she has a qualifying tax return. Don't forget to also look at the value of any assets that she might own, such as real estate, bank accounts, investment accounts, etc.

It depends on what you mean By be with your wife. If you mean being able to permanently stay in the U.S. after entering, the answer is no. However, you may be able to apply for a tourist visa to visit her in the U.S., although you may have problems having a tourist visa approved if the consulate believe you are planning to permanently stay in the U.S.

You have to have a sponsor for affidavit of support purposes in order for you to get an immigrant visa. Your wife would be the primary sponsor as the petitioner, even if her income is insufficient. IF she is not able to get someone to act as a joint sponsor with her, perhaps you can transfer assets to her bank account so that she can show the assets instead of income.

its unclear what did you mean that she could not sponsor you. If you meant her income is too low to sponsor you, you can find a co-sponsor.