'I wish I were' is a correct and usable part of a sentence in written English. You can use this phrase to express regret about something that is not true or cannot be changed. For example, "I wish I were taller so I could reach the top shelf.".
I wish I were!
Now I wish I were.
I wish I were dead".
I wish I were invisible.
I wish I were John Rockefeller.
"I wish I were making this up".
I wish I were more ruthless.
I love the desktop app, it’s always running on my Mac. Ludwig is the best English buddy, it answers my 100 queries per day and stays cool.
Cristina Valenza
Retail Lead Linguist @ Apple Inc.