“In the end there can be only one” – 665,000 results on Google
“In the end there can be only two” – 21 results
“In the end there can be only three” – 7 results
“In the end there can be only four” – 6 results
“In the end there can be only five” – 11 results
“In the end there can be only six” – 1 result
“In the end there can be only seven” – 9 results
“In the end there can be only eight” – 6 results
“In the end there can be only nine” – 1 result
“In the end there can be only 10” – 6 results
“In the end there can be only 11” – 1 result
“In the end there can be only 12” – 2 results
“In the end there can be only 13” – 0 results

I think I need a hobby…