If someone once had dyslexia would they ever be able to read like someone without dyslexia?

According to Dr. Sally Shaywitz' long-term research of over 30 years, children with Dyslexia who receive intensive, multimodal, long-term reading therapy can reach the normal Bell-shaped curve for reading decoding & comprehension, but usually not for fluidity of reading. Read her book, "Overcoming Dyslexia".
Absolutely. You are describing my very successful son.